应用AnnAGNPS模型模拟柴河上游农业非点源污染

Modeling Pollutant Load and Management Alternatives in Headwater of Chai River Watershed with AnnAGNPS

运用AnnAGNPS模型(Annualized Agricultural Non-Point Source Model)对柴河上游小流域农业非点源污染负荷进行模拟估算,并通过实地监测对模型模拟结果进行适用性检验。结果表明,该模型能够模拟流域上下游水质污染负荷总量及浓度变化,适合在该流域使用。运行结果显示模型模拟对总氮效果较好,对总磷的模拟结果较差。同时模型能够较好地模拟该地区8月份农业非点源污染负荷浓度及负荷总量均达到最大值的特点,与实测值相符,但对该地区春季农业非点源污染负荷突然增高的特点在模拟值中没有得以体现。年际变化的模拟结果表明该地区农业非点源污染负荷与当地降雨量有关,这说明气象因素在模型运行过程中起着至关重要的作用。同时也发现模型自带的气象发生器不适合在该地区使用。

In this paper the Annualized Agricultural Non-point Source Model（ AnnAGNPS ） was used to simulate the agricultural non-point source pollution load of Chai River＇s upriver watershed, in the Northeast China. The applicability of the model was tested by field survey. The result indicated the model was suitable to use in this watershed and the total nitrogen simulate results were better than the total phosphorus simulate results. The model was good at simulate the max value of total pollutant load and concentration in August but was not fit to simulate the abruptly increase of total pollutant load and concentration in spring. The simulate results of years showed the total pollutant load was related to the rainfall in this watershed which indicated the meteorologic factor played an important role in the simulation process. Meanwhile the weather generator was proved not fit to use in this watershed.